Focal Solid 1 monoblock stuck in protect

[ivkata]

this Focal Solid 1 is stuck in protection .there are no bad psu or output transistors ,no dc on the speaker terminals .nothing appears burned
Pwm is tl494cn

Pin 1:0.00
Pin 2: 1.35
Pin 3: 0.07
Pin 4: 1.53
Pin 5: 0.21
Pin 6: 0.45
Pin 7: 0.00
Pin 8: 13.97
Pin 9: 0.00
Pin 10: 0.00
Pin 11: 13.98
Pin 12: 13.98
Pin 13: 1.55
Pin 14: 1.55
Pin 15: 1.55
Pin 16: 0.00

 

[ivkata]

removed Q12 transistor a1266 and disabled the protection circuit ,amp powers on now .will test output tomorrow

 

[Perry Babin]

Either the 5v output (pin 14) is defective or something (external to the IC) is pulling the voltage on that pin down.

 

[ivkata]

yes that transistor is between pin 14 and pin 4

 

[Perry Babin]

If you load the amp, does it produce clean audio up to clipping (at rail voltage)?

 

[ivkata]

Yes amplifier produces clean audio output on my test speakers at home but they cannot handle the full power of the amp ,neither my neighbors .I'm gonna have to install it in my car and test it on the field

 

[ray9043]

A lot of years ago but i have the same amp with the same issue. Now is solved, in the protection circuit i replace C11, shorted to ground, so it turns on always the a1266 transistor.

 

[grantoutou]

Hello everybody, i have a focal solid 1 in protection mode, all wirring are ok, so i think my problem is with the amp.
Can you help me to repair it? thx a lot

 

[Perry Babin]

Please don't post in a repair thread that was started by someone else unless you are trying to help them.

Start a new thread if you need help with a repair of your own.

http://www.bcae1.com/temp/newthreaddiy01.png